Radiation from vibrating structures might be difficult to understand.
This animation is rather though to focus on the beauty of physics although their might also some interesting facts to be observed.
The idea for this animation is from Prof. Manfred Heckl who showed similar animations in his lectures. He also had the animation of a "sound eater" as a consequence of a tiny minus sign in the propagation function.  

 
For more details concerning sound radiation please check 
Monopole, Multipole, all the baffled and infinite plates 

